It's good that there are a few machines you can use. Sometimes I like to combine cardio machines in a workout -- 10 or 20 minutes on one, then 10 or 20 (or 30) on another. It helps to break up the routine. If you want music and don't already have an mp3 player, I recommend the Sansa Clip -- tiny, inexpensive, the clip holds well to various pieces of clothing, easy to use.